Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965277AbcKDRyE (ORCPT ); Fri, 4 Nov 2016 13:54:04 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:10617 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965259AbcKDRyB (ORCPT ); Fri, 4 Nov 2016 13:54:01 -0400 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Thu, 03 Nov 2016 22:53:37 -0700 From: Laxman Dewangan To: , , CC: , , "Laxman Dewangan" , Douglas Anderson , Aleksandr Frid Subject: [PATCH 2/2] regulator: pwm: Add ramp delay for exponential voltage transition Date: Fri, 4 Nov 2016 23:07:55 +0530 Message-ID: <1478281075-3498-2-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1478281075-3498-1-git-send-email-ldewangan@nvidia.com> References: <1478281075-3498-1-git-send-email-ldewangan@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2171 Lines: 67 Some PWM regulator has the exponential transition in voltage change as opposite to fixed slew-rate linear transition on other regulators. For such PWM regulators, voltage transition is same for all voltage change. Add support for handling the voltage transition ramp time when voltage transition is exponential. Signed-off-by: Laxman Dewangan CC: Douglas Anderson CC: Aleksandr Frid --- This patch is continuation of discussion on patch regulator: pwm: Fix regulator ramp delay for continuous mode https://patchwork.kernel.org/patch/9216857/ where is it discussed to have separate property for PWM which has exponential voltage transition. --- drivers/regulator/pwm-regulator.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 1b88e0e1..f990b86 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -47,6 +47,9 @@ struct pwm_regulator_data { /* Enable GPIO */ struct gpio_desc *enb_gpio; + + /* Voltage ramp time */ + u32 voltage_ramp_time; }; struct pwm_voltages { @@ -233,6 +236,14 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, return 0; } +static int pwm_regulator_set_voltage_time_sel(struct regulator_dev *rdev, + int old_uV, int new_uV) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + + return drvdata->voltage_ramp_time; +} + static struct regulator_ops pwm_regulator_voltage_table_ops = { .set_voltage_sel = pwm_regulator_set_voltage_sel, .get_voltage_sel = pwm_regulator_get_voltage_sel, @@ -305,6 +316,13 @@ static int pwm_regulator_init_continuous(struct platform_device *pdev, memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops, sizeof(drvdata->ops)); + + if (!of_property_read_u32(pdev->dev.of_node, + "pwm-regulator-voltage-ramp-time-us", + &drvdata->voltage_ramp_time)) + drvdata->ops.set_voltage_time = + pwm_regulator_set_voltage_time_sel; + drvdata->desc.ops = &drvdata->ops; drvdata->desc.continuous_voltage_range = true; -- 2.1.4